This course will teach you how to create a professional website layout using CSS. You will learn the basics of CSS, including selectors, properties, and values, as well as how to use them to create a visually appealing website. You will also learn how to use CSS to create responsive layouts
From Wikipedia
In Cascading Style Sheets, CSS grid layout or CSS grid creates complex responsive web design grid layouts more easily and consistently across browsers. Historically, there have been other methods for controlling web page layout methods, such as tables, floats, and more recently, CSS Flexible Box Layout (flexbox). CSS grid is currently not an official standard although it has been adopted by the recent versions of all current major browsers.